Abstract
Rare-earth doped yttrium oxide (Y233) is a good candidate to be used for the near infrared (NIR) fluorescence bioimaging. Coating of Y2O3 nanoparticles with polymer is one of the key issues to use Y2O3 nanoparticles as a fluorescent probe for the NIR fluorescence bioimaging. We developed a plasma fluidized bed for homogeneously exposing nanoparticles to the atmospheric plasma, which is expected to enhance chemical reactions in a system involving organic materials. Poly(acrylic acid) (PAAc) modified Y2O3 was exposed to the atmospheric plasma by using the bed. Improved acid durability and dispersion stability was observed after plasma treatment. These improvements do not correspond to thermal reaction of intra-reaction in PAAc chain, but can be assigned to a chelation reaction between Y3+ on the Y2O3 particles surface and COO- groups in PAAc chain.
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